Underreamer



Dec. 9, 1924. I 1,519,039-

' J. E. MORGAN ET AL UNDERREAMER Filed June 4, 192.3

WQ Mmm i ZKM/yg@ JIZJML 60j 3mm Patented Dec. 9, 1924.

UNITED STATES PATENT OFFICE.

JOHN E. MORGAN AND JOHN R. MCCOY, 0F OKEMAH, OKLAHOMA..

UNDERREAMER.

v Application led .Tune 4,

To all whom 'it may concern:

Be it known that we, JOHN E. MORGAN and JOHN R. vMCCOY, citizens of the United States, residing at Okemah, in the county of Okfuskee and State of Oklahoma, have invented a new and useful Underreamer, of which the following is a specification.

This invention aims to provide a simple means for undercutting a well casing, the device being so constructed that it may be inserted into the casing readily and be removed easily therefrom, after the occasion for the use of the device has passed.

It is within the province of the disclosure to improve generally and to enhance the utility of devices ofthat type to which the invention appertains.

With the above and other objects in view which will appear as the description proceeds, the invention resides in the combination and arrangement ofv parts and in the details of construction hereinafter described and claimed, it being understood that, within the scope of what is claimed, changes in the precise embodiment of the invention shown can be made Without departing from the spirit ofthe invention.

In the accompanying drawings Figure 1 shows in elevation, a device constructed in accordance with the invention, mounted in a well casing and in working position; Figure 2 is a longitudinal section wherein the top of the device has been removed; Figure 3 is a section at right angles to the showing of Figure 2; vFigure 4 is a cross section on the line 4-4 of Figure 3; Figure 5 is a cross section on the line 5 5 of Figure 2.

The device forming the subject matter of this application includes a body 1 comprising a main member 2 upon which a top 3 is detachably mounted as shown at 4, the main member 2 being hollow. A foot 5 is threaded at 6 on the lower end of the main member 2. The main member 2 has longitudinal slots 7, the lower edges of the slots 7 being downwardly and inwardly inclined as shown at 8. Cutters 9 are mounted in the main member 2 adjacent to the lower end thereof for transverse sliding movement, the member 2 having slots 10 which receive the cutters. A plunger is located within the main member 2 and comprises a stem 11 and an enlarged head 12 at the lower' end of the plunger, the head being provided with inclined ribs 14 which are dove-tailed into the 1923. Serial N0. 643,455.

cutters 9 as shown in Figure 5. Ribs 14 are preferably enlarged at their lower ends as shown at 15. kOn the upper endL of the stem 11 is disposed an abutment nut 16. A compression spring 17 surrounds the stem 11. one end of the spring engaging the abutment nut 16 and the other end of the spring engaging a transverse support 50 mounted in the memberk, the stem 11 being slidable in the support. Releasing members 18 are vertically slidable inside of the main member 2 and are equipped with upwardly extended outwardly inclined arms 19 slidably received in the slots 7, the lower edges of the arms 19 being inclined, as shown at 20 to cooperate with the inclined edges 8 of the slots 7. A removable handle, whichl may be in the form of an eye bolt is slidably mounted in the foot 5 and is connected by threading or otherwise, with the lower end of the head 12 of the plunger.

In practical operation, the plunger is pulled downwardly by means of the handle 21. and the cutters 9 are drawn inwardly, because the ribs 14 of the head 12 of the plunger are interengaged with the cutters, as shown in Figure 5. During this operation, the spring 17 is compressed between the abutment nuts 16 and the support 50. l/Vhen the cutters 9 arrive at a point below the lower end of the well casing, they tend to move outwardly, becausel the spring 17 tends to carry the plunger upwardly, the cutters being forced outwardly by the ribs 14 on the head l12 of the plunger. When the tool is rotated, the cutters 9 will ream out an enlarged recess below the well casing, as clearly shown in Figure 1. When the occasion for the use of the device has come to an end, the structure is drawn upwardly. r1`he arms 19 of the releasing members 18 are engaged by the lower end of the well casing 0r by some adjacent overhanging portion of the bore and are forced downwardly. As the releasing members 18 are forced downwardly, they tend to move inwardly, the inclined edges 20 ofthe arms 19 cooperating with the edges 8 of the slots 7 to secure this result7 the arms 19 of the releasing members 18 being housed within the slots 7. lVhen the releasing members 18 move downwardly, their lower ends engage the upper end of the head 12 of the piunger, and carry the pl unger downwardly, the ribs 14 on the head 12 drawing the cutters 9 inwardly. Thus, the entire device may enter the well casing, and be drawn upwardly.

What is claimed is:

In a device of the class described, a body having an opening, cutters slidable in the body, transversely of the body, a plunger slidable in the body and com rising a stem and an enlarged part locate between the cutters and operating to advance them into cutting position when the plunger is raised, spring means cooperating with the stem for raising the plunger, and a releasing member mounted in the opening for 4sliding movement longitudinally of the body and located entirely at one side of the stem, the releasing member engaging the enlargement of the plunger, the releasing member and the body having relatively inclined elements which co-operate to move the upper end of the releasing member laterally and outwardly with respect to the body when the releasing member is moved upwardly and longitudinally of the body.

,In testimony that we claim the foregoing as our own, .We have hereto affixed ourl signatures.

JOHN E. MORGAN. JOHN R. MCCOY. 

